Kind female scientist develops new cure to heal her comatose sister but since the drug is illegal she can't run clinical trials and tests it on herself. The cure turns slowly changes her until she finally becomes cruel vampire. She sucks her boyfriend dry and then "cures" her sister by changing into the same monster. last 3 pages is some other nurse vampire TF author posted on fanbox some time ago. Thematically similar and it was taking space on my disk so thought I will add it here.

This is English version.
Japanese version is here:
/g/2223640/fc86c2f088/

Also saw someone translated and posted spanish version here:
/g/2122897/08610762ee/
And chinese here:
/g/2098687/52dac20de9/

Author creates classic corruption stories and posts them on pixiv and fanbox. Office ladies, students, teachers and exorcists become evil and sexy monsters like Vampires, Succubi or Oni. They are pretty good though a bit short when it comes to text.
Some of his works are already posted here so I thought I will add some more. Author recently started adding english translations of his work. Translations are mostly through machine but they are not that bad and it's better than nothing. Below are some links:

Links:
Pixiv: https://www.pixiv.net/users/375450
Fanbox: https://www.fanbox.cc/@marsa
Twitter: https://twitter.com/marsax_